Guides and tools for people who make things
Most crafts run on a handful of numbers. A dough is defined by its hydration, a bar of soap by the ratio of lye to fat, a thrown pot by how much the clay will shrink on the way to the kiln door. Get those wrong and the work fails in ways that are obvious afterwards and invisible at the time.
This site explains those calculations, and keeps a small set of tools for the jobs that genuinely need software. The guides below are written to be read on their own — they explain the principle well enough that you could do the arithmetic on paper. The tools are free, need no account, and every one of them works inside your browser, so the files you open never leave your computer.
Guides
All guides- Baker's percentage and hydration: how bread recipes actually scale
Why flour is always 100%, what hydration predicts about a dough, why the starter changes the real figure, and how to scale a recipe from either flour weight or target dough weight.
- Lye, superfat, and why soap recipes are calculated rather than copied
Saponification, SAP values, why swapping oils without recalculating is dangerous, what superfat really does, and the three incompatible ways recipes express water.
- Clay shrinkage: why your pot comes out smaller than you made it
The two separate shrinkages a ceramic piece goes through, how to measure your own clay's rate with a test bar, and the formula for sizing a piece to finish at a target dimension.
- Epoxy mix ratios and exotherm: why “a bit more hardener” ruins a pour
Why epoxy's ratio is stoichiometry rather than a catalyst dose, how weight and volume ratios differ, and why deep pours overheat, crack and occasionally smoke.
- Aquarium stocking: what bioload actually means
Why the inch-per-gallon rule misleads, how the nitrogen cycle sets the real limit, and the behavioural constraints — schooling, territory, footprint — that volume never captures.
- What your photos reveal: EXIF, GPS, and when to strip it
What EXIF, IPTC and XMP actually store, which sharing paths preserve location data, the three ways to remove it, and the cases where keeping metadata is the right call.
Tools
Each tool lives on its own address and does one job. No signup, no limits.
Image Object Splitter
Detect the distinct objects in a photo and export each as its own file, with optional background removal. Runs entirely in your browser.
Photo Metadata Cleaner
See the EXIF and GPS metadata hidden in a photo, then remove it via canvas re-encode. Runs entirely in your browser.
ATS Resume Checker
Check a .docx or .pdf resume for common ATS parsing problems, find job-description keyword gaps, and see sourced ATS formatting rules — entirely in your browser.
EPUB Metadata Fixer
Check and fix an EPUB's title/author/identifier metadata, and check its cover image against KDP, Kobo, and Apple Books requirements.
Sourdough Calculators
Hydration, baker's-percentage recipe scaling, and starter feeding calculators.